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When I was using only Ubuntu 15.10, the boot time was very fast, it was about 15-20 seconds.

Recently I installed Kali-Linux rolling edition along side Ubuntu 15.10.
Afterwards the boot time of Ubuntu has drastically increased (Kali boots fast enough).
It takes almost 3 to 4 minutes -> "Ubuntu ....." loading.

  • My system partitions :

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I noticed that there is a gap of 72 Sec between line 971 to 972 in dmesg file.

I don't know why ?

Please help me to solve this problem.

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  • I had the same issue just one month ago, then I found that installing kali with the same swap partition of Ubuntu, automatically changed partition UUID. Let's take a look at this link, hope it can help you!
    – MKay
    Commented Feb 21, 2016 at 11:00
  • @MKay could you solve the problem? if yes please consider writing an answer. Thanks :-) Commented Feb 21, 2016 at 11:13
  • Could you post the output of journalctl command and of /etc/fstab file, please?
    – MKay
    Commented Feb 21, 2016 at 11:16
  • @MKay output posted., please see the updated question now :-) Commented Feb 21, 2016 at 11:34
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    Please post also the OP for blkid /dev/sda4, I'm sorry I forgot. Anyway if you search for lines containing swap in journalctl command OP you can see errors in mounting partition. I think that you could try copying UUID of /dev/sda4 in /etc/fstab of Kali and substituting it in /etc/fstab of Ubuntu, this should solve the issue!
    – MKay
    Commented Feb 21, 2016 at 11:53

2 Answers 2

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Boot from Ubuntu installation media.

Select Try Ubuntu without installing.

Step 1 : Reinstall the Ubuntu GRUB boot loader.

Open a terminal and execute :

sudo mount /dev/sda2 /mnt
sudo mount /dev/sda1 /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sda
update-grub  
exit

Step 2 : Correct the UUID entries in the fstab file.

Open another terminal and execute :

sudo blkid  

Open another terminal and execute :

sudo gedit /mnt/etc/fstab

Replace the UUID entries of sda1 | sda2 | sda3 | sda4

with those of the output given from the blkid command.

Close all terminals and reboot into Ubuntu operating system.

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  • Thank you very much for your quick response with working answer :-) , This solved my problem. I can now boot Ubuntu fast. BUT!! My Kali-lost its speed :-( please see this Invalid UUID error in kali Commented Feb 21, 2016 at 12:18
  • @SeverusTux : You're welcome ! ... and - the kali issue has to be fixed in kali ... enjoy ubuntu experience ! :)
    – cl-netbox
    Commented Feb 21, 2016 at 15:10
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Re-install grub and update entire fstab is more then necessary! if you wand the ubuntu splash-screen in grub instead kali splash-screen, yes you can reinstall grub.

kali(debian) installer, when installed belong another distro, do not take care about there have an existing swap partition so the installer format it again; once the swap partition has been formatted the UUID has change!

The only necessary is up to date the UUID of swap partition in the fstab and in "/etc/initramfs-tools/conf.d/resume" and regenerate the initramfs to let hibernation work again.

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